Inclusion of trans-resveratrol in methylated cyclodextrins: Synthesis and solid-state structures

Lee Trollope, Dyanne L. Cruickshank, Terence Noonan, Susan A. Bourne, Milena Sorrenti, Laura Catenacci, Mino R. Caira

Research output: Contribution to journalArticle

Abstract

The phytoalexin trans-resveratrol, 5-[(1E)-2-(4-hydroxyphenyl)ethenyl]-1,3-benzenediol, is a well-known, potent antioxidant having a variety of possible biomedical applications. However, its adverse physicochemical properties (low stability, poor aqueous solubility) limit such applications and its inclusion in cyclodextrins (CDs) has potential for addressing these shortcomings. Here, various methods of the attempted synthesis of inclusion complexes between trans-resveratrol and three methylated cyclodextrins (permethylated α-CD, permethylated β-CD and 2,6-dimethylated β-CD) are described. Isolation of the corresponding crystalline 1:1 inclusion compounds enabled their full structure determination by X-ray analysis for the first time, revealing a variety of guest inclusion modes and unique supramolecular crystal packing motifs. The three crystalline inclusion complexes were also fully characterized by thermal analysis (hot stage microscopy, thermogravimetric analysis and differential scanning calorimetry). To complement the solid-state data, phase-solubility studies were conducted using a series of CDs (native and variously derivatised) to establish their effect on the aqueous solubility of trans-resveratrol and to estimate association constants for complex formation.

Original languageEnglish
Pages (from-to)3136-3151
Number of pages16
JournalBeilstein Journal of Organic Chemistry
Volume10
DOIs
Publication statusPublished - Dec 29 2014

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Keywords

  • Cyclodextrin
  • Inclusion complexes
  • Thermal analysis
  • Trans-resveratrol
  • X-ray structures

ASJC Scopus subject areas

  • Organic Chemistry

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